1936 surcharges, 6c on 3c, 6c on 1c green (official), bar at top, "air mail" double, also handstamped in brown lake "via Air Mail six cents" on 2c violet, all used on flown cover from Monrovia (28.II) to Cape Palmas, with Harper arrival pmk the same day, v.f., signed Diena, rare (Cat No. C1-3) (Image)

Est.US$750